I think about something more in line of relative overkill, but contains evil restrictions of use.
One example for Hummies:
Delta Nuke
Idea: Similar usage as Lucifer Cannon, but instead of a bolt, an instant stream of energy is released against the target.
Ammo: 50 pts (75 with battpack), no extra mags
Cost: 1000
Damage: 200 (10 pts) -1000 (50pts) - 1500 (75 pts)
Rate of Fire: theory: always, practically: a "cool down" for 2 to 15 seconds
Speed: instant
Restriction: minimum charge is 10 pts. Each 10 pts of released energy will give the weapon a cool down of 2 seconds and will generate a EM-field in the area (approx 20m radius) surrounding the path of the beam for 1 second, that will disable all electronic equipment for that period of time.